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math.NA2012
The Deflated Conjugate Gradient Method: Convergence, Perturbation and Accuracy
K. Kahl, H. Rittich
Deflation techniques for Krylov subspace methods have seen a lot of attention in recent years. They provide means to improve the convergence speed of these methods by enriching the…
hep-lat2012★ 13 cited
2-norm error bounds and estimates for Lanczos approximations to linear systems and rational matrix functions
A. Frommer, K. Kahl, Th. Lippert +1
The Lanczos process constructs a sequence of orthonormal vectors v_m spanning a nested sequence of Krylov subspaces generated by a hermitian matrix A and some starting vector b. In…